$(function () {
    particlesJS('particles-js',
        {
            "particles": {
                "number": {
                    "value": 40,
                    "density": {
                        "enable": true,
                        "value_area": 800
                    }
                },
                "color": {
                    "value": "#ffffff"
                },
                "shape": {
                    "type": "circle",
                    "stroke": {
                        "width": 0,
                        "color": "#000000"
                    },
                    "polygon": {
                        "nb_sides": 5
                    },
                    "image": {
                        "src": "img/github.svg",
                        "width": 100,
                        "height": 100
                    }
                },
                "opacity": {
                    "value": 0.7,
                    "random": false,
                    "anim": {
                        "enable": false,
                        "speed": 1,
                        "opacity_min": 0.1,
                        "sync": false
                    }
                },
                "size": {
                    "value": 3,
                    "random": true,
                    "anim": {
                        "enable": false,
                        "speed": 40,
                        "size_min": 0.1,
                        "sync": false
                    }
                },
                "line_linked": {
                    "enable": true,
                    "distance": 150,
                    "color": "#ffffff",
                    "opacity": 0.6,
                    "width": 1
                },
                "move": {
                    "enable": true,
                    "speed": 6,
                    "direction": "none",
                    "random": false,
                    "straight": false,
                    "out_mode": "out",
                    "bounce": false,
                    "attract": {
                        "enable": false,
                        "rotateX": 600,
                        "rotateY": 1200
                    }
                }
            },
            "interactivity": {
                "detect_on": "canvas",
                "events": {
                    "onhover": {
                        "enable": true,
                        "mode": "grab"
                    },
                    "onclick": {
                        "enable": true,
                        "mode": "push"
                    },
                    "resize": true
                },
                "modes": {
                    "grab": {
                        "distance": 200,
                        "line_linked": {
                            "opacity": 1
                        }
                    },
                    "bubble": {
                        "distance": 400,
                        "size": 40,
                        "duration": 2,
                        "opacity": 8,
                        "speed": 3
                    },
                    "repulse": {
                        "distance": 200,
                        "duration": 0.4
                    },
                    "push": {
                        "particles_nb": 4
                    },
                    "remove": {
                        "particles_nb": 2
                    }
                }
            },
            "retina_detect": false
        }
    );

    $('#loginBtn').click(function () {
        submitForm();
    });
    document.onkeydown = keyDownSubmit;
    function keyDownSubmit(e) {
        // 兼容FF和IE和Opera
        var theEvent = e || window.event;
        var code = theEvent.keyCode || theEvent.which || theEvent.charCode;
        if (code === 13) {
            submitForm();
        }
    }
});

function submitForm(){
    if(StringUtils.isBlank($('#j_username').val()) || StringUtils.isBlank($('#j_password').val())){
        $("#login-notice").html("用户名和密码为必填项");
        return false;
    }
    $("#loginForm")[0].submit();
}